pitbulls

Question
How do I make my blue nose more aggressive???  he is a little to friendly with strangers.

Answer
Pit Bulls are supposed to be friendly.  You do not make your dog aggressive to strangers, that is a liability.  If you want a dog that protects you, find an experienced protection trainer.  They act aggressively on command, not to everyone.  A confident and well-adjusted dog is not going to be afraid or aggressive to people for no reason, and aggression can be based in fear, that is the wrong kind.  If you don't want him going up to strangers or jumping on them, have him heel and ignore them when you're walking him, but when someone does come up who is your friend, you need enough control to have the dog accept them.